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TI-2026-40018 Aliases CVE-2026-55454

Appsmith: Caddy admin API exposed without authentication

Priority HIGH 76CWE-1188Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 2.1, the bundled Caddy reverse-proxy's admin API — which has no authentication by default — is bound on 0.0.0.0:2019 inside the container. While this listener is not directly published to the host by docker-compose.yml, it is reachable from the Appsmith server process itself or a SSRF vulnerability. An authenticated low-privileged user can therefore drive the SSRF to issue POST /load (or any other admin-API call) against http://0.0.0.0:2019/, fully replacing the live Caddy configuration and taking over the reverse proxy. This vulnerability is fixed in 2.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00603 49th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed appsmith (appsmithorg): 2.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
appsmithorgappsmithbefore 2.12.1Patch availableCNA
  • appsmith Vendorappsmithorg Affected before 2.1 Fixed in 2.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:appsmith:appsmith:*:*:*:*:*:*:*:*before 2.1Vulnerableappsmithorg
  • cpe:2.3:a:appsmith:appsmith:*:*:*:*:*:*:*:* Versions before 2.1 Vulnerable ·appsmithorg

Remediation

  • Fix · CNA appsmith (appsmithorg) Fixed in 2.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55454

References

Exploit 1

  • TI-2026-18312 Account Takeover Vulnerability in Appsmith CVSS 3.1CRITICAL 9.7
  • TI-2026-36948 Appsmith: RCE via Supervisord XML-RPC Admin Interface Exposed via /supervisor Caddy Route CVSS 4.0HIGH 8.9
  • TI-2026-23691 Critical Stored XSS & Privilege Escalation in Appsmith CVSS 3.1CRITICAL 9.1
  • TI-2024-34357 AppSmith Community 1.8.3 before 1.46 allows SSRF via New DataSource for application/json… CVSS 3.1HIGH 8.5
  • TI-2022-03744 Server-Side Request Forgery (SSRF) in appsmithorg/appsmith CVSS 3.1MEDIUM 6.5
  • TI-2026-06406 Cross-site scripting in appsmithorg Appsmith CVSS 3.1MEDIUM 6.3
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences